421 East 78th Street: Apartments for Sale & Rent

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Last updated on Nov 27, 2025

421 East 78th Street

Recent Sales (10) $864 Avg. price/ft²
All Units in Building (16)

Apt. 2D

1 bed

1 bath

$399,000

Jan 26, 2023

Apt. 3B

Studio

1 bath

320 ft²

$317,000 +5.7%

$991

$300,000

Sep 23, 2021

Apt. 1C

$312,500

Nov 5, 2019

Apt. 2C

1 bed

1 bath

$425,000

Jul 26, 2019

Apt. 3D

1 bed

1 bath

$460,000

$425,000

Jul 23, 2018

Apt. 1B

Studio

1 bath

300 ft²

$310,000

$1,033

$315,000

Feb 22, 2017

Apt. 2C

1 bed

1 bath

$370,000 -9.6%

$415,000

May 5, 2015

Apt. 3D

1 bed

1 bath

$320,000

Jan 3, 2007

Apt. 1B

Studio

1 bath

300 ft²

$170,000

$567

Dec 14, 2005

Apt. 2D

1 bed

1 bath

$336,100

Sep 8, 2005

View Full Sales History

Overview of 421 East 78th Street

421 East 78th Street was built in 1910 and converted to co-op apartments in 1957. 421 East 78th Street has a total of 16 apartments and is located in Lenox Hill, a short walk to the 6 subway line.

Similar nearby buildings include 415 East 80th Street, 508 East 78th Street, 230 East 79th Street and 420 East 72nd Street. See more ->

Doorman

None

Type

Co-op

Year Built

1910

Converted: 1957

Apartments

16 (view all units)

Floors

Neighborhood

Lenox Hill (Manhattan)

Min Down

20%

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Area Map StreetView

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at Lexington Ave 0.45 miles

Sales History

Price/Room (Est)

Why are we displaying the estimated price per room?

For some co-ops, instead of price per square foot, we use an estimate of the number of rooms for each sold apartment to chart price changes over time. This is because many co-op listings do not include square footage information, and this makes it challenging to calculate accurate square-foot averages.

By displaying the price per estimated room count, we are able to provide a more reliable and consistent metric for comparing sales in the building. While we hope that this gives you a clearer sense of price trends in the building, all data should be independently verified. All data provided are only estimates and should not be used to make any purchase or sale decision.

Price/Ft² (Est)

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Sales Summary

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Sales History by Apartment Size

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Pricing Comparison of Similar Buildings

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Editorial Coverage

Santa's Helpers: New York apartments with fireplaces for under $600K Friday, December 20, 2019

The 74

between Second Avenue & Third Avenue

Lenox Hill

Gracious Upper East Side condos with Central Park and skyline views. Exquisite half- and full-floor homes by Rafael de Cardenas

Studios starting at $1,050,000
4 beds starting at $8,950,000
5 beds starting at $11,950,000

Learn More

RLS IDX Data display by CityRealty.com, LLC. This information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. ©2026 The Real Estate Board of New York, Inc., All rights reserved. IDX information is provided exclusively for consumers’ personal, non-commercial use and it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

All information furnished regarding property for sale, rental or financing is from sources deemed reliable, but no warranty or representation is made as to the accuracy thereof and same is submitted subject to errors, omissions, change of price, rental or other conditions, prior sale, lease or financing or withdrawal without notice. All dimensions are approximate. For exact dimensions, you must hire your own architect or engineer and for no listing shall the number of bedrooms listed be considered a legal conclusion.

All closed sales data has been provided by the New York City Department of Finance via the Automated City Register Information System (ACRIS). No warranty or representation is made as to the accuracy of any data provided by ACRIS or any other sources.

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An equal housing opportunity

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421 East 78th Street

Overview of 421 East 78th Street

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Sales History

Why are we displaying the estimated price per room?

Sales Summary

Sales History by Apartment Size

Pricing Comparison of Similar Buildings

Editorial Coverage

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